The Gem Mine is a silver and manganese mine located in Granite county, Montana.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Gem Mine MRDS details
Site Name
Primary: Gem Mine
Commodity
Primary: Silver
Primary: Manganese
Secondary: Gold
Secondary: Copper
Secondary: Lead
Tertiary: Phosphorus-Phosphates
Tertiary: Arsenic
Tertiary: Antimony
Location
State: Montana
County: Granite
District: Philipsburg (Granite-Flint Creek) District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Western Ore And Mining Co.
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement Vein
Operation Type: Unknown
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Flint Creek Range
Mineral Deposit Model
Not available
Orebody
Form: TABULAR
Structure
Type: R
Description: Philipsburg Batholith
Alterations
Alteration Type: L
Alteration Text: Oxidized
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: 40% MN, 18% S102, VERY LITTLE FE AND P.
Materials
Ore: Galena
Ore: Pyrolusite
Ore: Sphalerite
Ore: Tennantite
Ore: Psilomelane
Gangue: Quartz
Gangue: Rhodochrosite
Gangue: Calcite
Comments
Comment (Location): SIDE LINES THE TROUT CLAIM ON THE S SIDE.
Comment (Production): $10,000 AG (1906)
Comment (Development): UNTIL 1908 A PRODUCER OF AG, 1917 REOPENED FOR MN.
Comment (Deposit): ORE AND DEPOSITS RESEMBLE TROUT CLAIM BUT VEIN MUCH NARROWER. 2 IRREGULAR BODIES, ONE AJOINS THE GEM VEIN AND THE OTHER LIES ON THE N OR FOOTWALL SIDE AND EXTENDS INTO THE TROUT CLAIM. BOTH PITCH STEEPLY NE, PARRELL WITH THE DIP OF THE LIMESTONE.
Comment (Workings): SEVERAL SHALLOW SHAFTS AND PITS.
References
Reference (Deposit): USGS PP 78, P. 210.
Reference (Deposit): USGS BULL 1237.
Reference (Deposit): USGS BULL 922-G, P. 197
Reference (Deposit): USGS BULL 725, P. 163.
Reference (Production): USGS PP 78
Principal Gold Districts of Montana
In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.
